Cosmos - yellowing lower leaves

Discussion in 'Pests, Diseases and Cures' started by TheMadHedger, Jul 8, 2016.

  1. TheMadHedger

    TheMadHedger Gardener

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    This is my first year growing Cosmos from seed and the plants have been doing extremely well, growing tall and strong and now starting to flower.

    Mostly they are in flower beds, but a few are clustered together in large pots.

    The ones in the beds are mostly fine, only the occasional lower leaf is yellowing, but in one of the large pots many of the lower leaves (on otherwise healthy looking plants) are yellowing.

    There's no sign of mildew, no dark (or light) spots, just yellow leaves.

    I do get a lot of wind and rain in my area (particularly of late) so am wondering if there is some fungus at work here.

    Any ideas please?
     
  2. Sheal

    Sheal Total Gardener

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    Fertiliser is washed out of the soil of plants in pots MadHedger. Try feeding them regularly with something like tomato food, you may find that makes a difference. :)
     
  3. TheMadHedger

    TheMadHedger Gardener

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    Thanks very much, I'll try that. :)
     
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    • Anthony Rogers

      Anthony Rogers Guest

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      I'd say the same as Sheal. A regular feed with a tomato feed should soon sort them out :)
       
    • TheMadHedger

      TheMadHedger Gardener

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    • Anthony Rogers

      Anthony Rogers Guest

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      Hi MadHedger,

      Considering it's only an annual, I would go for half recommended strength once a week
       
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      • TheMadHedger

        TheMadHedger Gardener

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        Thank you kindly. :)
         
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